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January. 1935
The INTERNATIONAL PHOTOGRAPHER
Twentyfive
The bridge towers will be surmounted by aerial beacons.
The bridge will have a regular United States lighthouse station — the first of its kind in the world.
It will have a complete independent telephone, fire and police telegraphy system, and every modern device for
efficient operation, including a travelling platform below the deck for inspection, painting and maintenance, motordriven, and extending the full width of the bridge, insuring maximum vigilance in the care of the structure. From the Standpoint of the Exceptional The Golden Gate Bridge sets a precedent in being the only bridge ever authorized to be built across the extreme outer mouth of a major ocean harbor.
It is unique in that it is built under a voluntary pledge of the District's Directors not to award contracts if the total of all contracts as fixed by the engineering staff exceeded the bond issue amount of $35,000,000.
The estimated total cost, including interest and all other charges, will be well below the estimate named.
The construction work is expected to be entirely finished and the Golden Gate Bridge opened for traffic in May, 1937.
The Golden Gate Bridge Comparisons
1. All of the cement used in the structure is delivered in bulk in barges, from which it is pumped into storage tanks by special cement pumps operating somewhat on the principle of a vacuum cleaner. This total quantity of cement if delivered in barrels in the old-fashioned way, and these barrels placed end to end, they would make a single line reaching from New York to Wilmington, Delaware.
2. The necessary excavations during the progress of the work will be equivalent in volume to the material removed in digging a hole in the earth 10 ft. square and 26 miles deep.
3. The concrete required for the project would be equivalent to the displacement of 21 first line battleships of 33,000 tons each.
4. The total length of the wire contained in the two main cables is sufficient to construct two wire fences 6 feet high, spacing the wires 6 inches apart horizontally and vertically, paralleling the Coast and Redwood Highways from Mexico to Canada, a distance of 1644 miles or 3288 miles of fencing.
5. The tops of the towers are at the same height above the water as the roof of a 65-story building above the sidewalk.
6. Loaded to capacity with as many vehicles and pedestrians as could be placed upon it, and with a wind blowing in excess of 90 miles per hour, the bridge has a 2.6 factor of safety.
7. If a man walked 4 miles per hour for 8 hours each day it would take him 6 years and 10 months to walk from end to end of the wire used in the two cables.
8. The steel inspection ladders running from top to bottom of each tower, with one in each cell unit, represent a total length of 23 miles.
9. The two main cables if put end to end would extend the full length of Market Street in San Francisco (3 miles).
10. It takes 450 freight cars to deliver steel for one tower.
The Marin Tower of the Golden Gate Bridge — Tower Is Practically Completed.
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